expression, noun-modifying (irregular)
slender and stylish; slim and shapely
Describes a woman with a slim, well-proportioned figure, especially with long, shapely legs. Often used in literary or descriptive contexts.
She is a slender and stylish beauty.
A slim and shapely model walked the runway.
すらりとした is a more common and neutral way to describe a slim, tall figure, while 小股の切れ上がった is a literary set phrase specifically emphasizing stylish, shapely legs.
The phrase literally means 'the small crotch has cut and risen', referring to the visual effect of long legs making the crotch appear higher. The exact origin is uncertain, but it is a traditional poetic description of a woman's figure.